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/usr/share/alsa/alsa.conf.d/50-pulseaudio.conf is in libasound2-plugins 1.1.1-1ubuntu1.

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# Add a specific named PulseAudio pcm and ctl (typically useful for testing)

pcm.pulse {
    type pulse
    hint {
        show on
        description "PulseAudio Sound Server"
    }
}

ctl.pulse {
    type pulse
}